UBTU-20-010072 - The Ubuntu operating system must automatically lock an account until the locked account is released by an administrator when three unsuccessful logon attempts have been made.

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By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account.

Satisfies: SRG-OS-000329-GPOS-00128, SRG-OS-000021-GPOS-00005


Configure the Ubuntu operating system to lock an account after three unsuccessful login attempts.

Edit the '/etc/pam.d/common-auth' file. The 'pam_tally2.so' entry must be placed at the top of the 'auth' stack.

Add the following line before the first 'auth' entry in the file:

auth required pam_tally2.so onerr=fail deny=3

See Also


Item Details

References: CAT|III, CCI|CCI-000044, CCI|CCI-002238, Rule-ID|SV-238235r653880_rule, STIG-ID|UBTU-20-010072, Vuln-ID|V-238235

Plugin: Unix

Control ID: 5ef8c1d57d19409fd285421636bf8101b695f7f758e00132c1bd98c281bfca31